waite



No. 770,618. PATENTED SEPT. 20, 1904.

Gr. B. WAITE.

EXTENSIBLE GENTERING SUPPORT.

APPLICATION FILED JULY 5, 1904.

No MODEL.

Patented September 20, 1904.

PATENT OFFICE.

GUY B. WAITE, OF NEW YORK, N. Y.

EXTENSIBLE CENTERlNG-SUPPORT.

SPECIFICATION forming part of Letters Patent No.V 770,618, datedSeptember 20, 1904.

Application filed July 5, 1904. Serial No. 215,329. (No model.)

To all whom, it may concern:

Be it known that I, GUY B. WAITE, acitizen of the United States,residing in the city, county, and State of New York, have inventedcertain new and useful Improvements in Extensible @entering-SupportsEmployed in the Construction of Arches, of which the following is aspecification.

My invention relates to an improved form and construction of temporarycentering-supports used in the construction of arches of concrete,masonry, and the like.

My present invention relates to the same general subject-matter as isdisclosed in Letters Patent No. 724,146, granted to me March 31, 1903,being in the nature of an improvement upon the construction disclosed inthe said patent. In accordance with the aforesaid patent I haveextensively employed in the construction of arches a support for thelagging consisting of a pair of wooden ribs disposed side by side andeach having lixed to one end a laterally-extending rest-piece, on whichthe adjacent end of the other rib is slidably supported with the ends ofthe rest-pieces or other extension members of the ribs stepped on thelower flange of the permanent I-beamsupports of the arch. I have foundin practice that the ends of these rest-pieces or extension membersusually leave considerable of a hole in the concrete when removed andbeing permanently secured to the ribs render necessary the use ofseparate sets of ribs and rest-pieces for arches of varying heights.

It is the object of my present invention to improve upon thisconstruction in the way of presenting a smaller obstruction to theconcrete illing and enabling the same ribs and rest-pieces to beemployed in the construction of arches of varying heights.

To these ends my invention consists, generally stated, in thecombination, with the centering-ribs and laterally-extending rest-piecessecured to the lower edges thereof at their opposite ends, of detachablesuspension-hooks, secured to said rest-pieces and considerably narrowerthan the latter, adapted to engage the lower flange of the permanentI-beam or other supports of the arch, and thus support the ribs from thelatter.

My invention further consists in a novel means for securing therest-pieces to the ribs in such a manner as to insure against theiraccidental separation under unusual strain, such means consisting of awire or strap in the form of a loop carried over and around the rib andsecured to or near the rear end of the rest-piece, thus tying the latterto the rib by a tension member capable of resisting the maximum strainsto which the ribs are ever subjected in practice.'

I have illustrated my invention in the accompanying drawings, wherein-Figure 1 is a vertical cross-section through that portion of an archediireproof floor of concrete or the like lying between two adjacentI-beams, showing my improved centering structure in side elevationtherein. Fig. 2 is a similar View, broken away intermediatethe I-beams,of a similar structure adapted for the formation of a low or iiat arch.Fig. 3 is a top plan View of Fig. 1, omitting the concrete and lagging.Fig. 4 is a perspective View of one end of the companion ribs and theirsupporting means; and Fig. 5 is a perspective view of the parts shown inFig. 4 at a different angle, illustrating the means and manner ofattachment of the rest-piece to the rib and of the hanger to therest-piece.

Referring to the drawings, 10 designates the usual I-beams or gil-ders,constituting permanent supports for the arch.

11 designates an arched filling of concrete, cement, or other ireproofmaterial. To support this material as it is laid in place, I employ aseries of transverse ribs disposed side by side in pairs, said ribsbeing designated by 12 and themselves directly supporting thelagging-strips 13.

14 designates each of a pair of what I term rest-pieces, secu red toopposite ends, respectively, of the two ribs, each of said rest-piecesextending laterally of the rib to which it is secured suiiiciently toconstitute a direct rest or support for the adjacent end of the otherrib with capacity for the latter to slide thereover a limited distanceto suit the distance between the I-beams, all as fully disclosed in myformer patent above referred to.v

Heretofore and at present in the case of comparatively short ribs therest-pieces may be and are secured to the latter by nailing or screwingthem in place, as indicated at 15. In the case of long ribs and ribssubjected to unusually heavy loads, however, there is danger that therest-pieces may break away from the ribs before the arch is completelyfilled in or set, and to obviate this danger one feature of my presentimprovement consists in the employment of a loop 16 of wire or strapmetal, which is fitted around the rib with its lower ends passed throughapertures in orl carried around the rear end of the rest-pieces and thenturned inwardly and nailed, twisted together, or otherwise secured to orbeneath the rest-piece, as plainly shown at 17 in Fig. 5. By this meansthat portion of the restpiece subjected to the greatest strains tendingto disrupt it from the rib is securely united to the latter by a tensionmember easily capable of resisting such strains without interfering withthe operation of the companion rib.

In order to support the ribs and rest-pieces from the I-beams, I employnarrow bent iron suspension hooks or hangers 18, which are nailed bytheir lower horizontal portions 18 to the under side of the outer end ofthe restpiece approximately coincident with the transverse center of thelatter, as shown at 19 in `Figs. 1 and 5, their vertical portions lyingopposite the end of the rest-piece and rib and their outer projectinglips 18b taking over the lower flange of the I-beam. As illustrated inFigs. 1 and. 2, these suspension-hooks will be made of varying heights,according to the various heights of arches to be served by the ribs, andwith a given set of ribs and restpieces permanently secured thereto allthat is necessary to adapt the ribs to an arch of any given height is toselect from among the hooks such as are of the height required and nailor otherwise secure them to the restpieces, removing and replacing themby lower or higher hooks for subsequent uses as to the particularformation of subsequent arches may necessitate. The arch shown in Fig. 1is a high arch, and consequently the hooks 18 required therefor are lowor short. The arch served by the construction shown in Fig. 2 would be alow or flat arch, which would require the use of a long or high hook-18.Obviously intermediate arches would require hooks intermediate thedimensions represented in these two figures. The hooks as herein shownare narrow and rectangular in cross-section; but it is obvious that thevertical and upwardly-projecting portions of the hook would serveequally well if made of round metal. Preferably the vertical portion ofthe hook is carried up in direct face contact with the outer end of therest-piece and rib to the extent that it follows thelatter, thisdisposition of the parts contributing to increased rigidity and strengthof the structure as a whole. This, however, is not essential, and theupright member of the hook may be more or less separated fronrthe end ofthe rib to provide more space for lagging or concrete when desired.

While I have shown and described the upper bent ends of the hooks asadapted to take over and rest upon the iianges of the permanent I-beamsupports and contemplate such as their principal mode of use, yet such amanner of supporting the hooks is not of the essence of the invention.In some cases side boards running parallel with the I-beams on eitherside of and suspended from the latter are employed, and in such casesthe upper ends of the hooks would hook over the upper edges of such sideboards. My invention also is not concerned with any particular form orcontour of centering-ribs.l For convenience and brevity of illustrationI have shown only plain rectangular ribs; but it is obvious that theherein-described rib supporting and suspending means are applicable toother forms of ribs, such as curved ribs or ribs having straightintermediate portions and rounded or cut-down ends.

I claim- 1. In a centering-support for arches, the combination with apair of ribs disposed side by side and longitudinally adjustablerelatively to each other, of rest-pieces secured to opposite ends ofsaid ribs, respectively, each adapted to support the adjacent end of thecompanion rib, and suspension-hooks secured to said rest-pieces andextending upwardly and forwardly of the ends of the ribs, substantiallyas described.

2. In a centering-support for arches, the combination with a pair ofribs disposed side by side and longitudinally adjustable relatively toeach other, of rest-pieces secured to the lower edges of said ribs atopposite ends thereof, respectively, each adapted to support the4adjacent end of the companion rib, and narrow suspension-hooks securedto the under sides of said rest-pieces, and extending upwardly andforwardly of the ends of the ribs, substantially as described.

3. In a centering-support for arches, the combination with a rib and arest-piece for the adjacent endof a companion rib extended laterallyfrom the lower edge of said first-named rib, of means for securing saidrest-piece to said rib consisting of a metal loop or band embracing saidrib and rest-piece and constituting a tension-bond between said parts,substantially as described.

#1. In a centering-support for arches, the

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combination with a rib and a rest-piece for l sion-bond between saidparts, substantially as the adjacent end of a companion rib extendedlaterally from the lower edge of said lil-stnarned rib, of means forsecuring said restpieee to said rib consisting of a metal loop 0r bandembracing said rib and rest-piece through apertures in the latter andconstitutingatenas described.

` GUY B. WAITE. Witnesses:

JESSE GRANT- ROE, LEONARD V. Ron.

